Needle-actuating mechanism for sewing machines



June 25, 1929. F. L UTZ 1,718,427

NEEDLEl ACTUATING MEGHANI'SM FOR SEWING MACHINES Filed June 6, 1927 Jvwamtoa Patented June 25, 1929.

UNITED STATES PATENT (gp-FICE,

FRIEDRICH' LUTZ, 0F STUTTGART,

GERMANY, ASSIGNOR ENFABRIK, G. M. B. CH., OF STUTTGART, GERMANY.

NEEDLI-ACTUATING MECHANISM SEWING MACHINES.

Application led .Tune 6, 1927, Serial No. 196,966, and in Germany June 23, 1926.

The invention relates to new and useful improvements in needle actuating mechanisms for sewing machines, and more particularly to the means for supporting the lneedle lever which imparts reciprocations to the needle bar carrying the needle or needles.

An object of the invention is to provide a needle lever supporting means wherein the needle lever is provided with a fulcrum support at both sides of the needle lever, and wherein the Isupporting stud for the needle lever is provided with tapered bearings capable of endwise adjustment in the supporting bushings therefor for taking up wear..

A further object of the invention 1s to provide a needle lever supportingr means of the above type, wherein the yneedle lever 1s capable of lateral adjustment on the supporting shaft or stud therefor, so that the needle lever may be lined up relative to the' needle bar which is reciprocated thereby.

In Ithe drawings- Figure l is a front view of a machine cmbodying the improvements, and

F ig. 2 is a sectional view on the line A-B of Fig. l.

The invention has to do with a needle lever which imparts reciprocation to the needle bar. The invention is directed to the means for vsupporting the needle lever and also to the means for shifting the needle lever on its support for lining up the needle lever relative to the needle bar. The needle level' is rigidly attached-to a sha-ft or stud which is provided withapered bearing sections, one at each side of the needle lever. The needle lever is mounted within the frame or housing of the sewing machine, and these tapered bearings are journaled in bushings carried by the frame. Meansis provided whereby the stud or sha-ft supporting the needle lever is capable of en dwise adjustment relative to the frame for taking up the wear on the bearings. The needle lever is attached to the supporting stud or shaft so that it may be adjusted endwise thereof for lining up 'to the needle 'b ar. e l Referring more in detail to the drawings, the invention isv shown as applied to a sewing machine including a supporting bed and an overhanging arm, atvthe outer. end of which the needle bar b reciprocates.v Mounted on the needle bar is needle a. The needle bar is reciprocate .by aflever d which the needle lever relative bearing.

out departing from the a needle bar,

ing ,said needle bar,

is connected to the needle bar by a link c. The lever d is located within the frame of the sewing machine and is oscillated or vibra-ted therein by an eccentric strap g cooperating with an eccentric f on the main shaft e. The needle lever d is mounted on a shaft or stud 7L. The needle lever is formed with a hub through which the shaft or stud passes, and the needle lever is rigidly secured to the stud or shaft h by screws o, o. This shaft or stud lz, is provided with tapered bearing sections'lc, le, one at each side of the needle lever a? and tapering in the same direction. The frame of the machine is formed with bosses e', 'i whichv are bored' to receive bushings, and mounted vin the bushings carried by the frame. A collar n is placed on one end of TO YUN ION SPECTAL MASCHIN- the tapered bearings are.

the shaft outside-of the frame, and a collar n. placed on Vthe otherend of the shaft outside of the frame. Nuts m, m/ are threaded on to the respective ends Z, Z of the sha-ft. They may be set in' any desired position on this shaft or stud 'which supports the needle bar. By loosening the nuts m and turningup on the nuts m,'the shaft .may be moved endwise in the frame, and the bushings therefor for taking up the wear in the By loosening the screws 0, o, the needle lever maybe shifted on the shaft or stud carrying the same for the purpose of lining up the lever withthe needle bar.

It is obvious that minor changes in the details of construction may be made withs'plrit of the invention as .set forth inthe appended claims.

Having thus described the invention, what I claim'asnew and desire to secure by Letters Patent, isf 1. A sewing machine including a frame, a needle carried thereby, a needle lever within the frame for reciprocat-` tion, 'means carried by said frame at the-"opposite sides of said lever for' supporting the lrespective tapered `bearings whereby the oscillate, .means wheretaking up the wear in the bear- 2. A sewing machine including a'frame,

shaft may be adjusted-dn the` a shaft to which said needle lever vis attached, said shaft having bearing sections tapering in the same direcroo means whereby said needle lever .in the same direction, means carried by said frame at the opposite Side-S of said lever fer supporting the respective tapered bearings whereby the shaft may freely oseillate, c01- .lars on the ends of said shaft adapted to engagey the outer faees,'respeetively, of the frame, nuts threaded on to the ends ofthe' Sha't't for holding the shaft in position and permitting endwise adJustment thereof, and mennel whereby the needle lever may be ad- .jnsled endwise of the shaft for positioning lthe same in theframe and alining the needle lever with the needle bar.

0 3. A Sewing machine including a frame,

a needle bar, a needle earried thereby, a needle lever Within the frame for reciprocating the-needle bar, a shaft to which said needle lever is attached, leaid shafthaving bearing sections taperingin the same direction, one of which is l@mailer in its maXin'nun diameter than the other in its ninin'nnn diameter, bushings earred by said frame at the opposite sides of said lever and Shaped. for receiving and supporting Jthe. respective tapered hearings wherebyr the shaft may freely oseillate in said bushings, meaneI for securing said -shat't in Said bushings and for adjusting-the sameeln'lwise to take, up Wear, and means whereby-.the needle. lever may be adjusted endw'ise of theshaft for alining the same with the needle bar. I

In testimony whereof, I aflix my signature.

e FRIEDRICH LUTZ.. 

